When Chip spots Professor Nimbul's growth ray gun in the rubble his black nose turns red.
The headline for the newspaper in which the rangers are trapped reads "Donner." However, in later shots, the start of the headline reads "Ner." The headlines were set within a box and the box is visible both times (meaning that the paper simply shifting would not account for the error).
Zipper broke the doorway when he was leaving Ranger headquarters due to his enlarging size, but when the Rangers return home, their door was undamaged.